The Dynamic Characteristics Research Of Prestressed Anchorage Structure’s Exposed Section

Prestressed anchorage structure is widely used in large bridge engineering and geotechnical engineering, because of its advanced nature and reliability. However, it exists great loss of prestress or failure problem in used. There were a lot of engineering accidents, which caused a lot of loss of life and economic. In order to avoid structure happening accidents and improve construction safety,we need an effective detection method and the corresponding test procedures to solve this problem. The main research work and achievements of this paper are as follows:In this paper, according to the working principle of prestressed anchorage structure, regard the anchor and anchor stock as a generalized quality.Then regard the Anchor and anchor plate’s contact surface as the tangential stiffness of the spring is connected to k(the anchor plate is the reference point).It becomes a single degree of freedom vibration model of generalized mass-spring.To build a prestressed beam experimental model in the laboratory and load the finishing rolling rebar from5tons to45tons step by step(each level of5tons) in different grades of prestressed reinforced.To apply nuts different size transverse load used jack when the planished steels are in the different levels of prestress.Then analyse the relationship between the lateral load and displacement to prove the feasibility of the simplified into single degree of freedom vibration model.Based on the corresponding relation of contact surface shear stiffness and normal force, apply excitation F (t) in the anchorage tangentially and fix the acceleration sensor to accept the corresponding vibration signal generated by the excitation in the corresponding position.Then the signal collecting analyzer to get input, output signal. To distinguish the contact surface tangential stiffness k according to the input signal, the output power and establish correspondence between anchor tension and stiffness of k usd the least square parameter identification method, genetic algorithm, neural network parameter identification method respectively.To get the optimal analysis program of the identification of the tangential stiffness K and put forward the test method of the tension of prestressed anchorage structure.It provides reference for developing different types of prestressed anchorage structure tension tester drawing up the technical order of prestressed anchorage structure tension test which suitables for different industries. Once it is applied in the country,it will completely change the state of prestressed anchorage structure tension without quantitative measurement, improve the reliability of construction and thoroughly solve prestressed anchorage structure’s great loss of prestress and failure problem. It has the important technical and economic significance to improve prestressed anchorage structure’s durability,reliability, security and stability and avoid serious accidents.